missing alert message in register page

### Description of issue
there is alert message while we summit need that alert

### Expected result
need alert

### Actual result
no alert

### Steps to reproduce
1. put alert message

```
Path: /
Browser: Chrome 111.0.0.0 on Windows 10
Viewport: 1806 x 1094 @1.25x
Language: en-US
Cookies: Enabled
```

[Open in BrowserStack](https://www.browserstack.com/user/try-live?url=https%3A%2F%2Fdeploy-preview-1--sharpandclean.netlify.app%2F&os=Windows&os_version=10&browser=Chrome&browser_version=111.0&resolution=1806x1094&speed=1&start=true&ref=netlify-source)

Submitted from [Netlify Deploy Preview #1](https://deploy-preview-1--sharpandclean.netlify.app/)

Start at the register page served at `/` and reproduce the submission flow in Chrome using the linked deploy preview. Trace where the form submission is handled and determine what alert should appear; done means submitting the form displays the expected alert message.

Written by the indexing model from the issue text.